code: def is_string(var):
      return isinstance(var, str)
  
imports: import base64
  import logging
  import os
  from glob import glob
  from io import IOBase
  from typing import Iterable, List, Mapping, Optional, Set, TypeVar, Union
  from neptune.internal.types.stringify_value import StringifyValue
label_desc: Use image node_id 7 for calling a global function with example usage: is_string(var) and returns: isinstance